What are the fundamental theoretical considerations in the development of superconducting materials for practical power transmission applications, and what are the current theoretical limits in terms of temperature and critical current density?
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- This property makes superconductors ideal for power transmission as they can carry large amounts of current without energy loss. Show more…
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Critical Current Density in Superconductors. One problem with some of the newer high-temperature superconductors is getting a large enough current density for practical use without causing the resistance to reappear. The maximum current density for which the material will remain a superconductor is called the critical current density of the material. In 1987 , IBM research labs had produced thin films with critical current densities of $1.0 \times 10^{5} \mathrm{A} / \mathrm{cm}^{2}$ (a) How much current could an 18 -gauge wire (see Example 25.1 in Section 25.1$)$ of this material carry and still remain superconducting? (b) Researchers are trying to develop superconductors with critical current densities of $1.0 \times 10^{6} \mathrm{A} / \mathrm{cm}^{2}$ . What diameter cylindrical wire of such a material would be needed to carry 1000 $\mathrm{A}$ without losing its superconductivity?
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Critical Current Density in Superconductors. One problem with some of the newer high-temperature superconductors is getting a large enough current density for practical use without causing the resistance to reappear. The maximum current density for which the material will remain a superconductor is called the critical current density of the material. In $1987,$ IBM research labs had produced thin films with critical current densities of $1.0 \times 10^{5} \mathrm{A} / \mathrm{cm}^{2} .($ a) How much current could an 18 -gauge wire (see Example 25.1 in Section 25.1 ) of this material carry and still remain superconducting? (b) Researchers are trying to develop superconductors with critical current densities of $1.0 \times 10^{6} \mathrm{A} / \mathrm{cm}^{2}$ What diameter cylindrical wire of such a material would be needed to carry 1000 A without losing its superconductivity?
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One problem with some of the newer high-temperature superconductors is getting a large enough current density for practical use without causing the resistance to reappear. The maximum current density for which the material will remain a superconductor is called the critical current density of the material. In 1987, IBM research labs had produced thin films with critical current densities of 1.0Ă—10^5 A/cm^2. Researchers are trying to develop superconductors with critical current densities of 1.0Ă—10^6 A/cm^2. What diameter cylindrical wire of such a material would be needed to carry 1000 A without losing its superconductivity?
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